my 04 600ho SDI sounded cool with its JandT can on it before I had an update done to by a dealer. NOW it sounds stupid!!! Is this something to do with the update or is it the fact that I asked him to check out my rings so he did a compression test and then pulled the Y pipe off to visually inspect them? The exhaust sounds way different than it did for sure! Seems to me like there is more sound coming from the middle of the sled now (engine area). The dealer told me the internet is my best friend and my worst enemy, referring to the fact that I read about the bad ring problems and he claims it is hardly a problem at all and he has seen almost NO bad rings on the 04s. He wasnt even gonna look at my rings but only minutes after I left the dealership a SDI WITH bad rings came in. He claims mine look fine and my compression was/is 150 per side. Anyway, did he not seal up the exhaust good or something? I noticed also when I first started it after picking it up, there was alot of smoke coming up from the engine area too? When I greased the front zerks on my 7c REV I forgot to use any high temp silicone on my pipe (I didnt pull the Y pipe though) and my 7c sounds fine (the same).